File and Directory Permissions Modification

Adversaries may modify file or directory permissions to evade defenses.

Executes dropped EXE

Modifies Watchdog functionality

Malware like Mirai modifies the Watchdog to prevent it restarting an infected system.

Unexpected DNS network traffic destination

Network traffic to other servers than the configured DNS servers was detected on the DNS port.

Checks hardware identifiers (DMI)

Checks DMI information which indicate if the system is a virtual machine.

Creates a large amount of network flows

This may indicate a network scan to discover remotely running services.

Creates/modifies Cron job

Cron allows running tasks on a schedule, and is commonly used for malware persistence.

Creates/modifies environment variables

Creating/modifying environment variables is a common persistence mechanism.

Enumerates active TCP sockets

Gets active TCP sockets from /proc virtual filesystem.

Enumerates running processes

Discovers information about currently running processes on the system

Modifies init.d

Adds/modifies system service, likely for persistence.

Modifies rc script

Adding/modifying system rc scripts is a common persistence mechanism.

Modifies systemd

Adds/ modifies systemd service files. Likely to achieve persistence.

Reads MAC address of network interface

Fetches the MAC address of active network interfaces. May be used to detect known values for hypervisors.

Reads hardware information

Accesses system info like serial numbers, manufacturer names etc.

Removes the immutable protection flag from a file

Uses chattr to remove the immutable flag from a file, allowing previously write-protected files to be modified or deleted.

Write file to user bin folder

Modifies Bash startup script